Improve Compatibility

Tell us what’s happening:

Your code so far


<style>
  :root {
  background:red;
    --red-color: red;
  }
  .red-box {
    background:red;
    background: var(--red-color, red);
    height: 200px;
    width:200px;
  }
</style>
<div class="red-box"></div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks/

You don’t need to add anything in " :root "